/*
	Implement atoi to convert a string to an integer.
	Hint: Carefully consider all possible input cases. 
	If you want a challenge, please do not see below and ask yourself what are the possible input cases.
*/

int myAtoi(char* str) {
	if( str != EOF){
		if( str >= '0' && str <= '9' ){
    		return str - '0';
    	}
    	return 
	}else{
		return NULL;
	}
}

int main(){
	
}